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26 April 2024 |
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The NIRSPEC Brown Dwarf Spectroscopic Survey. I. Low-Resolution Near-Infrared Spectra | | Ian S. McLean
; Mark R. McGovern
; Adam J. Burgasser
; J. Davy Kirkpatrick
; L.Prato
; Sungsoo S. Kim
; | | Date: |
9 Sep 2003 | | Journal: | Astrophys.J. 596 (2003) 561-586 | | Subject: | astro-ph | | Abstract: | We present the first results of a near-infrared (0.96-2.31 micron) spectroscopic survey of M, L, and T dwarfs obtained with NIRSPEC on the Keck II telescope. Our new survey has a resolving power of R = 2000 and is comprised of two major data sets: 53 J-band (1.14-1.36 micron) spectra covering all spectral types from M6 to T8 with at least two members in each spectral subclass (wherever possible), and 25 flux-calibrated spectra from 1.14 to 2.31 microns for most spectral classes between M6 and T8. Sixteen of these 25 objects have additional spectral coverage from 0.96-1.14 microns to provide overlap with optical spectra. Spectral flux ratio indexes for prominent molecular bands are derived and equivalent widths (EWs) for several atomic lines are measured. We find that a combination of four H2O and two CH4 band strengths can be used for spectral classification. Weak (EW~1-2 angstrom) atomic lines of Al I and Ca I disappear at the boundary between M and L types. | | Source: | arXiv, astro-ph/0309257 | | Services: | Forum | Review | PDF | Favorites | |
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